问题
判断题
诊断起动机运转无力故障时,首先应检测蓄电池是否亏电,其次应排除电路接触不良问题,最后才检测起动机内部是否发生故障。
答案
参考答案:对
诊断起动机运转无力故障时,首先应检测蓄电池是否亏电,其次应排除电路接触不良问题,最后才检测起动机内部是否发生故障。
参考答案:对
完形填空。 | ||||
Dick Smith, 1 18 -year-old boy, thinks that the most important people in his 2 are his friends. 3 fact may people like Dick Smith think that their family members (成员) and even their 4 don't know them as well 5 their friends do. In large families, we have already found that brothers and sisters can not get on 6 with each other. It is very important for young people 7 one good friend or a group of friends. They are nearly at the same age and 8 up together. They usually spend a lot of time on the phone. 9 is very important in children's growing up. Because friends can discuss something difficult to say in their families. However some parents often try to choose their children's friends for them. Some parents even stop their children from 10 their good friends. | ||||
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阅读以下关于数据库性能优化方面的叙述,回答问题1至问题4。
某企业核心业务系统运行性能不佳,尤其是针对数据库的操作,响应时间过长。
为此,该企业专门召开了解决该问题的专家研讨会。在会上刘工指出,当前硬件设备的价格比较低廉,只需要对数据库服务器的硬件设备进行升级,同时对数据库管理系统和操作系统中的相应参数进行调整就可以了;王工建议对应用系统中使用的SQL语句进行调优,针对每条SQL语句都建立对应的索引;张工认为该业务系统中存在大量的数据查询操作,更新操作不多,尤其是存在大量的只读查询操作,应该针对这一点进行优化。
该企业采取了专家的部分建议,但优化的结果仍然不尽如人意,通过专门的监控,发现数据库管理系统中建立的索引存在问题。
【问题1】 对上述专家意见和建议进行评价;给出自己的建议,并说明其中包含的内容。 |